<!DOCTYPE html>
<html>
<head> 
    <meta charset="utf-8">
    <title>菜鸟教程(runoob.com)</title> 
</head>
<body>

    <p>计数： <output id="result"></output></p>
    <button onclick="startWorker()">开始工作</button>
    <button onclick="stopWorker()">停止工作</button>

    <p><strong>注意：</strong> Internet Explorer 9 及更早 IE 版本浏览器不支持 Web Workers.</p>

    <script>
        var w;
        function startWorker() {
            if(typeof(Worker) !== "undefined") {
                if(typeof(w) == "undefined") {
                    w = new Worker("demo_workers.js");
                }
                w.onmessage = function(event) {
                    document.getElementById("result").innerHTML = event.data;
                };
            }
            else {
                document.getElementById("result").innerHTML = "抱歉，你的浏览器不支持 Web Workers...";
            }
        }

        function stopWorker(){
            w.terminate();
            w = undefined;
        }
    </script>

</body>
</html>